Some interesting comments from people that have experienced the same thing on reddit: https://reddit.com/r/homelab/comments/voy9kl/cyberpower_cp15...
One guy got a video of his burning up on his Ring doorbell as he rushed it outside: https://i.imgur.com/EzalwYC.mp4
Tear down: https://youtu.be/9gqBzLNMFe4
I have contacted CyberPower for more information.